Concerns Raised Over MS Drug

WASHINGTON -- A Food and Drug Administration official said that some patients would still die of a rare brain disorder if the multiple-sclerosis drug Tysabri were allowed back on the market.

The drug's manufacturers Biogen Idec Inc. and Elan Corp. are asking the agency to let Tysabri back on the market, with restrictions. The companies pulled the drug in February 2005 after two patients developed a rare brain disorder, known as...